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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 12,990 | $ 22,063
Restricted cash | 795 | 794
Marketable securities | 52,234 | 73,472
Interest and other receivables | 564 | 752
Prepaid assets | 474 | 1,336
Total current assets | 67,057 | 98,417
Property and equipment, net | 92 | 974
Deposits and other assets | 195 | 410
Total assets | 67,344 | 99,801
Current liabilities: |  |
Accounts payable | 1,397 | 3,429
Accrued compensation and benefits | 3,946 | 5,216
Accrued restructuring charges | 94 | 1,972
Accrued liabilities | 1,783 | 3,480
Fair value of derivatives | 367 | 51
Total current liabilities | 7,587 | 14,148
Commitments and contingencies |  |
Stockholders' equity: |  |
Preferred stock, $0.001 par value; 3,000,000 shares authorized; no shares issued and outstanding at December 31, 2013 and 2012 |  |
Common stock, $0.001 par value; 300,000,000 shares authorized; 130,677,949 and 130,242,695 shares issued and outstanding at December 31, 2013 and 2012, respectively | 131 | 130
Additional paid-in capital | 952,403 | 939,867
Accumulated deficit | (892,763) | (854,384)
Accumulated other comprehensive (loss) income | (14) | 40
Total stockholders' equity | 59,757 | 85,653
Total liabilities and stockholders' equity | $ 67,344 | $ 99,801

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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